FCC Technician Class Exam Study Guide - 2014-2018/Subelement T8 Group A
Modulation modes: bandwidth of various signals; choice of emission type
The Question Pool
[edit | edit source]Question 1
[edit | edit source]- Which of the following is a form of amplitude modulation?
- A. Spread-spectrum
- B. Packet radio
- C. Single sideband
- D. Phase shift keying
The correct answer is C.
Question 2
[edit | edit source]- What type of modulation is most commonly used for VHF packet radio transmissions?
- A. FM
- B. SSB
- C. AM
- D. Spread Spectrum
The correct answer is A.
Question 3
[edit | edit source]- Which type of voice mode is most often used for long-distance (weak signal) contacts on the VHF and UHF bands?
- A. FM
- B. DRM
- C. SSB
- D. PM
The correct answer is C.
Question 4
[edit | edit source]- Which type of modulation is most commonly used for VHF and UHF voice repeaters?
- A. AM
- B. SSB
- C. PSK
- D. FM
The correct answer is D.
Question 5
[edit | edit source]- Which of the following types of emission has the narrowest bandwidth?
- A. FM voice
- B. SSB voice
- C. CW
- D. Slow-scan TV
The correct answer is C.
Question 6
[edit | edit source]- Which sideband is normally used for 10 meter HF, VHF and UHF single-sideband communications?
- A. Upper sideband
- B. Lower sideband
- C. Suppressed sideband
- D. Inverted sideband
The correct answer is A.
Question 7
[edit | edit source]- What is the primary advantage of single sideband over FM for voice transmissions?
- A. SSB signals are easier to tune
- B. SSB signals are less susceptible to interference
- C. SSB signals have narrower bandwidth
- D. All of these choices are correct
The correct answer is C.
Question 8
[edit | edit source]- What is the approximate bandwidth of a single sideband voice signal?
- A. 1 kHz
- B. 3 kHz
- C. 6 kHz
- D. 15 kHz
The correct answer is B.
Question 9
[edit | edit source]- What is the approximate bandwidth of a VHF repeater FM phone signal?
- A. Less than 500 Hz
- B. About 150 kHz
- C. Between 10 and 15 kHz
- D. Between 50 and 125 kHz
The correct answer is C.
Question 10
[edit | edit source]- What is the typical bandwidth of analog fast-scan TV transmissions on the 70 cm band?
- A. More than 10 MHz
- B. About 6 MHz
- C. About 3 MHz
- D. About 1 MHz
The correct answer is B.
Question 11
[edit | edit source]- What is the approximate maximum bandwidth required to transmit a CW signal?
- A. 2.4 kHz
- B. 150 Hz
- C. 1000 Hz
- D. 15 kHz
The correct answer is B.